Troubleshooting
60
Samsung Electronics
4-3-3 Communication error between INVERTER and MAIN PBA (E203)
1. Check items
1) Does the INVERTER PCB power light on?
2) Check the power cable/fuse
3) Does the INVERTER PCB (CN31) communicate well with MAIN PCB (CN39)
4) Check the communication cable
2. Check Procedure
Yes
Yes
Exit
No
Does the communication
error occur?
Check the power cable/fuse
1. Check the power cable between Main PCB and EMI PBA
2. Check the power cable between INVERTER PCB and EMI
PBA
3. (3phase model) Check the fuse (Fuse 100) of INVERTER
PCB: SHORT – normal, OPEN - faulty
No
Power switch on 30sec
after power off
Replace the INVERTER PCB or MAIN PCB
1. If E203 error is displayed on the 7-segment of OUTDOOR
UNIT MAIN PCB
→
MAIN PCB is normal, Replace the
INVERTER PCB.
2. LED of INVERTER PCB is as following:
Red: ON, Green: ON, Yellow: blinking
→
INVERTER PCB is
normal.
Replace the INVERTER PCB
[1phase model]
LED900
Check the communication cable
No
Yes
[3phase model]
1
2
2
3
[3phase model]
[1phase model]
Does the INVERTER PCB power light ON?
(check the LED)
INVERTER PCB (CN31)
1
2
INVERTER PCB (CN31)
MAIN PCB (CN39)
MAIN PCB (CN39)
Does the INVERTER PCB (CN31)
communicate well
with MAIN PCB (CN39)\
[LED of INVERTER PCB
3phase model]
[LED of INVERTER PCB
1phase model]
[7-segment of MAIN PCB]
